Renewable energy has been touted as a way to drastically reduce greenhouse gas (GHG) emissions. However, the process of making clean energy sources -- such as wind turbines out of cement, steel, and aluminum -- actually releases copious amounts of GHGs in the process. Fortunately, a new startup company called Rondo Energy is developing a "heat battery" to generate extreme heat for manufacturing using renewable energy instead of coal or oil. Steelmaking generally requires coal to be heated up to 1,800 degrees F, but the revolutionary "heat battery" can generate high-pressure steam and use clean electricity to superheat bricks up to 2,000 degrees F.

The "heat battery" also provides an alternative option to other emission solutions such as carbon capture and hydrogen fuel, which many people argue encourages the use of fossil fuels rather than transitioning away from them.

Steelmaking is one of the most carbon-intensive processes in the world and accounts for about 8% of GHG emissions. Rondo Energy thinks its technology will be able to cut global CO2 emissions by 1% in the next decade and drastically decarbonize the steel and concrete industry, allowing for clean energy to be made cleaner.